650661000 has 128 divisors (see below), whose sum is σ = 2214725760. Its totient is φ = 157728000.

The previous prime is 650660999. The next prime is 650661029. The reversal of 650661000 is 166056.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23142 + ... + 42858.

It is an arithmetic number, because the mean of its divisors is an integer number (17302545).

Almost surely, 2^650661000 is an apocalyptic number.

650661000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 650661000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107362880).

650661000 is an abundant number, since it is smaller than the sum of its proper divisors (1564064760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

650661000 is a wasteful number, since it uses less digits than its factorization.

650661000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19752 (or 19738 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 650661000 is about 25508.0575505074. The cubic root of 650661000 is about 866.5326387085.

It can be divided in two parts, 65066 and 1000, that added together give a palindrome (66066).

The spelling of 650661000 in words is "six hundred fifty million, six hundred sixty-one thousand".